Malicious PDF — malware analysis report

Static analysis result for SHA-256 65be687206f44b81…

MALICIOUS

PDF

76.7 KB Created: 2021-05-22 02:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 79fd3db28bec2a0531be22efdfe5363b SHA-1: 28ca58b541e1f759752ec9b37ba0f8ce709f742d SHA-256: 65be687206f44b8174d56213fd738fbe7fcd3483105de0674322328ff95278e5
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, with one prominent URL pointing to a site associated with malicious activity. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of a download button lure further supports a phishing or malware distribution scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mezovuduw.ru/strik?utm_term=how+to+get+free+diamonds+in+ml+no+ban PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474752/normal_6051eb0169e14.pdfIn PDF document text
    • https://tobivuzulukimu.weebly.com/uploads/1/3/1/3/131384599/7475196.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461205/normal_5fe696cc5f697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486566/normal_601a0fb713090.pdfIn PDF document text
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/4704389.pdfIn PDF document text
    • https://zumegopepotiko.weebly.com/uploads/1/3/1/3/131398003/8050156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465402/normal_605140094fb85.pdfIn PDF document text
    • https://wigulasekejum.weebly.com/uploads/1/3/4/4/134492960/5c38ff2.pdfIn PDF document text
    • https://lepefolavexar.weebly.com/uploads/1/3/0/8/130874674/mozizex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/942929ec-b1e1-41c9-bca0-4386bed4e922/maledapegipupoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92f94bac-8261-40a9-93d9-6e226587d3f8/21397700043.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/dumogasugabub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7740f525-e120-4575-bbf4-ddc7f493f608/kazinovamiwujurosubafiwev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de9b93ac-5ed9-48af-a84b-3126ab68fc89/hp_laserjet_1320_printer_driver_download_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d31d59c6-cdd4-42a2-b0e6-33ac43b62160/52337136593.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/java_tutorial_for_beginners_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/pdf_marketing_management_philip_kotler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b6d3334-8bc8-40e7-b46a-ea3c561b56c6/jebezuluvixezijotemob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c81a6ef5-0096-4e1e-b91f-4a4cae0c3dc0/96827911392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7177e406-a731-44f5-b2c4-431fc030f913/dinuxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/921fc7d5-c7b4-4286-b4e8-7cf7a051e97b/interpreting_box_and_whisker_plots_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe4805bb-c10d-4c7e-ad8e-e9cd90d9118b/gunafekowuda.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/acronis_true_image_2014_bootable_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/jabagerexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1622cc57-94aa-4c49-8560-42fe3b5ff3b0/which_book_is_best_for_iit.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 5420 bytes
SHA-256: 801cccc7dc1423f51f833ea0fb0943301156fec1df48eda7b6aefa83f776ac90
font_01_sfnt_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 10924 bytes
SHA-256: 1f118860603340615fcb0ed1527e17292f9512ac991364d48783cf16503f7aa2